US1805139A - Drilling machine - Google Patents

Description

May 12, 1931. B. 2. GOOD DRILLING MACHINE Filed Jan. 23,. 1950 Patented May 12, 1931 BRUCE Z. GOOD, OF 'IIFFIN, OHIO, ASSIGNOR THE LOOIJIIS IVIACHIIJE COMPANY, OF TIFFIN, OHIO, A CORPORATION OE OHIO DRELLING MACHINE Application filed January 23, 1830. Serial Ha li 32,941.

This invention relates to drilling machines, and particularly to the means by which the drilling tool is raised and lowered.

In machines of the type to which the invention relates, the line carrying the drilling tool passes about a sheave mounted on the end of a spudding beam which is rocked about a horizontal axis to raise and lower the tool. The movement of the spudding beam is controlled by a crank, rotating about a horizontal axis in front of the spudding beam axis and having a wrist pin which rides in a slot extending longitudinally of the beam. In the construction heretofore used, however, the upward swing of the spudding beam as the tool starts on its downward stroke has been so fast that too much slack was provided in the line, permitting it to kink or to become tangled. Also, as the tool rebounded after the impact, the line would not be withdrawn quickly enough to catch it on the rebound, thus causing a sudden jerk on the line as it became taut.

With the above facts in mind, it is the object of the present invention to provide means for controlling the movement of the spudding beam so that upon the downward stroke of the tool, the line will be released at a rate closely approximating the rate at which the tool drops under the influence of gravity. Such a result is efiected by a curved slot, the convexity of the curve being downward. Such a slot also causes the line to be withdrawn with a quick initial movement so that the tool is caught on the rebound and con tinues its upward movement without any jerk.

The invention in its preferred form is illustrated in the accompanying drawings, in which Figure 1 is a side elevation of the spudding beam and the parts associated therewith.

Figure 2 is a partial front elevation of the same. 1

As illustrated in the drawings, the spudding beam 5 is pivoted at its rear end, as indicated at 6, and a keeper 7 is secured to its front end for receiving ayoke 8 or similar support, which carries a rope guide, here represented as a sheave 9. The drill line 10 passes about the sheave 9 and about a sheave 11, which is mounted on the pivot 6.

The beam 5 is oscillated aboutthe pivot 6 through the medium of a crank 12 mounted on a shaft 13 which may be continuously rotated by a bull wheel l i secured thereon or by other suitable means. The beam 5 is enlargedon its underside adjacent the crank 12, as indicated at 15, and is covered by a shoe or plate 16 suitably secured thereto. An iron 17, preferably T-shaped in cross section is mounted on the underside of the beam in any suitable manner. In the present instance the iron 17 is shown as having one end secured by bolts 18 and the other end mounted within the yoke 8, and held by a buffer spring 19. Thus a slot 20 is provided with upwardly curved ends, which receives a wrist pin 21 carried by the end of the crank 12. A suitable anti-friction roller or collar 22 may be mounted on the pin 21.

In the operation of the machine, when the drill line has been withdrawn to raise the tool, the pin 21 will be approximately at the bottom of its circular path. As the crank continues to rotate, assuming that it rotates in a clockwise direction as viewed in Figure 1, the pin 21, approximately during the first 90 of its rotation, will ride substantially from the center of the slot 21 to the rear end thereof. If the slot 20 were straight, the rate of movement of the front end of the beam 5 would be substantially proportional to the sine of the angle through which the crank had passed since leaving its lowermost position. In other words, the maximum rate of movement of the beam would be reached when the crank had rotated througl'i an angle of approximately 90. By curving the rear end of the slot upwardly, however, the acceleration in the movement of the beam 5 is lessened and rendered more uniform, so that it closely approximates the acceleration of the movement of the tool under the influence of gravity. As the pin enters the upper half of its orbit, it moves from the rear end of the slot 20 toward the center thereof and the curvature of the slot causes continuous acceleration in the movement of the beam 5 until the pin 21 approaches its uppermost position. The curve of the slot 20 is so designed that the upward movement'of the beam 5 for the greater part of its duration approximates the rate at which the tool drops 5 under the influence of gravity so that there is always as little slack as possible in the line 10.

As the pin 21 passes through the uppermost part of its path, the tool strikes the bottom of the hole and rebounds. Aset-he pin 21 passes toward the front end of the slot the initial downward movement of beam is much quicker than it would be with a straight slot so that the line is withdrawn quickly enough to catch the tool on the rebound and to continue the upward movement thereof with an approximately uniform deeeIeration until the pin 21 and the beam 5 reach their lowermost position.

Vhile I have shown and illustrated the invention in what appears to be its preferred form, it is to be understood that the same may be modified to a considerable extent without any material departure from 25 the scope of the invention as defined by the claim.

\Vhat I claim is: In a drilling machine, the combination of a spudding beam pivoted at its rear end,;a

guide mounted on the forward end of said beam, a flexible line associated with said guide, said beam having a slot extending longitudinally of its front end, and a-crankrotating about a horizontal axis and having a pin riding in said slot to rock the beam and thereby control the tightening and the releasing-of said line, said slot being curved upwardly toward each end.

In testimony whereof I have hereunto 0 signed myname to this specification.

BRUCE 2. GOOD.

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